Before helping make Gorillaz great, producer Dan the Automator and rapper Del the Funky Homosapien joined forces to imagine life in the 31st century. Del (as Deltron Zero) defeats MCs from Mercury to Pluto on “Battlesong,” part of a greater narrative about wresting societal control from corporate tyrants as the Intergalactic Rhyme Federation Champion. Gorillaz mastermind Dave Albarn croons a hook (“Time Keeps on Slipping”), as does Sean Lennon (“Memory Loss”). But Del’s dense rhymes about memory apprehension glasses, Soulsonic Mantroniks, Optimus Prime, the Silver Surfer and a million other things command the spotlight.